Cylinder-piston of a rotary compressor

ABSTRACT

An unsymmetrical cylinder-piston of a rotary compressor having a body with a bearing for receipt of a rotatable cylinder-piston shaft therein; two spaced walls extending from the body and having opposing parallel surfaces; a wall interconnecting the two spaced walls at their end remote from the body to form an opening in the cylinder-piston for receipt of a rectangular piston in slidable relation therein, the spaced walls being bolted to the body and connecting wall and the body being balanced making the center of gravity of the unsymmetrical cylinder piston on or close to the axis of the bearing located therein.

CROSS REFERENCE TO RELATED APPLICATIONS

This application is a continuation-in-part of my co-pending application,Ser. No. 318,876, filed Nov. 6, 1981, to issue as U.S. Pat. No.4,431,387 on Feb. 14, 1984, which is a continuation-in-part of my priorapplication, Ser. No. 93,599, filed Nov. 13, 1979, now abandoned, whichis a continuation-in-part of my prior application, Ser. No. 821,729,filed Aug. 4, 1977, and issued as U.S. Pat. No. 4,174,195 on Nov. 13,1979, which is a continuation-in-part of my prior application, Ser. No.692,199, filed June 2, 1976, now abandoned, which is acontinuation-in-part of my prior application, Ser. No. 659,430, filedFeb. 19, 1976, now abandoned.

BACKGROUND OF THE INVENTION

This invention relates in general to a rotary compressor, and moreparticularly to a cylinder-piston of such rotary compressor.

Reciprocating piston compressors are well known in the art. Theypossess, however, inherent disadvantages of having reciprocating motionof a piston causing high stresses in certain components, vibration,noise, and limiting their rotational speeds. Due to speed limitationsreciprocating compressors are also relatively bulky and heavy machines.

Various types of rotary compressors have been proposed to replace thereciprocating piston compressor in order to overcome some of itsdisadvantages, and to realize new advantages. One approach which hasbeen taken is to develop new types of rotary compressors such as thosedescribed in more detail in my issued U.S. Pat. Nos. 4,137,022 and4,174,195, and in my co-pending application Ser. No. 318,876, filed Nov.6, 1981, to issue as U.S. Pat. No. 4,431,378 on Feb. 14, 1984.

The cylinder-piston described and claimed in this application is thesingle most important component of the rotary compressors of myinvention.

SUMMARY OF THE INVENTION

The rotary compressors of my invention are more fully described in myissued U.S. Pat. Nos. 4,137,022 and 4,174,195, and in my allowed patentapplication to isssue as U.S. Pat. No. 4,431,378, disclosures of whichare incorporated herein in full by reference. In all those Patents, theterm "cylinder-piston" refers to an element operating as both a cylinderand a piston, although the configuration of this element is not at allgeometrically cylindrical.

The cylinder-piston of this invention comprises generally a body and twospaced, parallel walls extending from the body and connected at theirends remote from the body by a connecting wall. The parallel walls arebolted to the body and to connecting wall to form the cylinder-piston.

OBJECTS OF THE INVENTION

One object of the present invention is to provide a cylinder-pistonwhich is simple and inexpensive in production.

Another object of the present invention is to provide a cylinder-pistonwhich is compact and lightweight.

These and other objects of the present invention will become apparentwhen reading the annexed detailed description in view of the attacheddrawing.

BRIEF DESCRIPTION OF THE DRAWING

FIG. 1 is a perspective view of the assembled cylinder-piston element.

DESCRIPTION OF THE PREFERRED EMBODIMENT

The rotary compressor using the cylinder-piston element of thisinvention is more fully described in my issued U.S. Pat. Nos. 4,137,022and 4,174,195, and in my allowed patent application to issue as U.S.Pat. No. 4,431,378 on Feb. 14, 1984, disclosures of which areincorporated herein in entirety by reference.

Referring first to FIG. 1, the cylinder-piston according to oneembodiment of the invention is indicated generally by numeral 250.Cylinder-piston 250 comprises body 253 and spaced walls 254 and 255extending from body 253 and connected at their ends remote from body 253by connecting wall 256.

Spaced walls 254 and 255 are bolted to body 253 and connecting wall 256by suitable bolts or screws 270.

Spaced walls 254 and 255 have opposing parallel surfaces 258 and 259;body 253 has surface 257 and connecting wall has surface 260. Surfaces257, 258, 259 and 260 define an opening in cylinder-piston 250 in whicha piston operates. Surfaces 258, 259 and 257 form three of four movablesurfaces of one compression chamber, and surfaces 258, 259 and 260 formthree of four movable surfaces of second compression chamber.

Bearing 264 is located in housing 261 of body 253. The portion of body253, remote from spaced walls 254 and 255 is sufficiently large to actas a balancing means to balance cylinder-piston 250 by making a centerof gravity of cylinder-piston 250 located on or close to the axis of itsbearing 264. Balancing weight inserts or voids may also be used in thisportion of body 253 to obtain good balance, particularly when thecylinder-piston is constructed of lightweight material.

I claim:
 1. An unsymmetrical cylinder-piston of a rotary compressorcomprising:a body having bearing means for receipt of a rotatablecylinder-piston shaft therein, two spaced walls extending from said bodyand having opposing parallel surfaces, a wall interconnecting said twospaced walls at their ends remote from said body to form an opening insaid cylinder-piston for receipt of a rectangular piston in slidablerelation therein, said spaced walls bolted to said body and saidconnecting wall, and said body having balancing means capable of makinga center of gravity of said unsymmetrical cylinder-piston on or close tothe axis of said bearing means.